Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Lei Sun,Wei Zhang,Yakun Feng,Zequn Fan,Lei Jiang,Can Lu
Biodegradable microplastics (BMPs) and cadmium (Cd) present substantial risks to agricultural systems, primarily affecting plants. Most current studies have focused on the ecological effects of virgin BMPs. However, the effects of ultraviolet (UV)-aged BMPs and their interactions with cadmium (Cd) on pakchoi remain largely unknown. Therefore, this study addressed this gap by aging polylactic acid (PLA) microplastics (MPs) through UV irradiation and conducting an indoor hydroponic experiment. The research systematically examined the individual and combined impacts of Cd, virgin, and UV-aged BMPs on pakchoi ( Brassica chinensis L. ), focusing on plant growth, photosynthesis, antioxidant systems, and Cd accumulation. The results showed that after 21 days of UV irradiation (UPLA MPs), UPLA MPs with a fractured surface had a more significant impact on pakchoi than untreated PLA MPs. Cd alone inhibited pakchoi growth, development, and photosynthesis, while PLA/UPLA MPs alone promoted these processes. Under the combination of Cd and PLA/UPLA MPs, UPLA MPs could effectively alleviate the toxic effect of Cd on pakchoi. Besides, Cd coexisted with PLA/UPLA MPs, and with the increase of Cd concentration, UPLA MPs(41.22 %, 66.80 %, 45.57 %) decreased the Cd content of pakchoi more significantly than PLA MPs(37.87 %, 55.91 %, 26.35 %). Meanwhile, the results of Partial least squares structural equation models (PLS-SEM) further showed that UPLA MPs could effectively reduce the accumulation of Cd in plants. Therefore, the results of this study can provide a new perspective and reference for the ecological risk evaluation of Cd and BMPs pollution in agricultural soils.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Zhongyou Jiang,Shanshan Dong,Dingying He,Jiazheng Yang,Suqing Dai,Shuaitao Peng,Suhua Chen
Bonded nitrogen of lone pair electrons gives a chance for carbon-based substrates to complex with and consequently electrochemically analyze heavy metals, e.g., cadmium(II) (Cd(II)). However, the carbon atom bonded with nitrogen atom present positively charged and could electrostatically hinder Cd(II) adsorption, leading to a limited electroanalytical sensitivity. In this study, we adopted a sequential iron occupying and nitric acid etching strategy to elongate C–N bond in graphitic carbon nitride (CN), which could weaken the energy barrier for Cd(II) adsorption. Material characterizations show the iron occupying and nitric acid etching strategy successfully elongated C–N bond without damaging the skeletal structure of CN and significantly enhanced Cd(II) adsorption capacity. Experiments combined with first principle calculations verified the efficient and sensitive binding of Cd(II) with nitrogen in the elongated C–N. As a result, in comparison with pristine CN, the C–N elongated material (marked as EtCN–Fe 0.3 ) possessed a much higher sensitivity (22.34 vs. 16.92 μA ppb −1 cm −2 ) and a dramatically lower limit of detection (LOD) (0.29 vs. 2.22 ppb). The sensor demonstrates a broad linear range (1−500 ppb), exceptional reproducibility (relative standard deviation = 1.4 %), and long-term stability (only 1.1 % of sensitivity loss over 10 days). EtCN–Fe 0.3 electrode even showed high recovery rates (98.2−102.4 %) in various real waters, which were in agreement with Inductively coupled plasma-mass spectrometry (ICP-MS)/Atomic absorption spectrophotometry (AAS) methods. This study provides a facile strategy to activate carbon materials to electrochemically detect trace heavy metals with precision and cost-effectiveness.
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PubMed
高影响因子
ELECTROPHORESIS
·
2015
·Vol. 36
·期 17
·2120-2127
·
IF 3.028
Lu Yangfang,Wang Hui,Xue Yun,Gu Xue,Wang Yan,Yan Chao
Submicron, non-porous, chiral silica stationary phase has been prepared by the immobilization of functionalized β-CD derivatives to isocyanate-modified silica via chemical reaction and applied to the pressurized capillary electrochromatography (pCEC) enantio-separation of various chiral compounds. The submicron, non-porous, cyclodextrin-based chiral stationary phases (sub_μm-CSP2) exhibited excellent chiral recognition of a wide range of analytes including clenbuterol hydrochloride, mexiletine hydrochloride, chlorpheniramine maleate, esmolol hydrochloride, and metoprolol tartrate. The synthesized submicron particles were regularly spherical and uniformly non-porous with an average diameter of around 800 nm and a mean pore size of less than 2 nm. The synthesized chiral stationary phase was packed into 10 cm × 100 μm id capillary columns. The sub_μm-CSP2 column used in the pCEC system showed better separation of the racemates and at a higher rate compared to those used in the capillary liquid chromatography mode (cLC) system. The sub_μm-CSP2 possessed high mechanical strength, high stereoselectivity, and long lifespan, demonstrating rapid enantio-separation and good resolution of samples. The column provided an efficiency of up to 170 000 plates/m for n -propylbenzene.
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PubMed
高影响因子
Materialia
·
2025
·
IF 2.9
Jiaxuan Wang,Jun Pan,Han Wu
This study aims to develop PVDF composite membranes with excellent comprehensive performance by hydrophilic modification of PVDF membranes. Specifically, polyvinylpyrrolidone (PVP) was used as a porogen and dispersing agent, while β-cyclodextrin (β-CD) and chitosan (CS) served as hydrophilic modification agents. A novel β-CD/CS/PVDF composite membrane was prepared using a blending phase transformation method. This membrane exhibits excellent hydrophilicity, underwater superoleophobicity, mechanical strength, self-cleaning ability, antibacterial performance, high separation performance, and biocompatibility. The experimental results indicate that the modified membrane with the optimal ratio (MF-β/C-2/3) achieved a pure water flux of 721.79 L·m −2 ·h −1 ·bar −1 , an underwater oil contact angle exceeding 140°. The membrane exhibited exceptional retention and separation capabilities for various concentrations of MB, MG, RB, MO, Pb 2+ , and Cr 6+ . It achieved a separation efficiency exceeding 99% for both oil-water mixtures and oil-water emulsions, and also demonstrated excellent separation performance when treating simulated wastewater containing multiple pollutants. In addition, ten cycles of separation experiments were conducted for organic dyes, heavy metal ions, oil-water mixtures, oil-water emulsions and simulated wastewater respectively. The results showed that after ten cycles of reuse, the modified membrane retained good separation efficiency and water flux, demonstrating exceptional separation stability. Research has shown that PVDF composite membranes have a promising prospect in the treatment of printing and dyeing wastewater. They can simplify the process flow, reduce costs, efficiently intercept pollutants, increase operational stability, and improve treatment efficiency. They have important practical significance in promoting the resource utilization of printing and dyeing wastewater.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shikai Li,Hanbing Gao,Rui Xu,Zhaohui Guo
Cation and oxyanion heavy metals possess opposite physical and chemical properties, which could be hard to simultaneous remediate in soil. In this study, layered double hydroxides from secondary aluminum ash (SAA-LDH) has been synthesized for soil remediation contaminated with heavy metals. The as-obtained SAA-LDH exhibit strong affinity for heavy metals, which could remove 193.50 mg‧g −1 of Cr(Ⅵ) and 175.84 mg‧g −1 of Cd(Ⅱ) within 2 h. Optimum acid-base resistance and selectivity guarantee the practice potential of SAA-LDH, which could remove above 85 % of Cd(Ⅱ) and Cr(Ⅵ) under widely pH range (from 4.00 to 10.00), capturing above 90 % of Cd(Ⅱ) and Cr(Ⅵ) under the interference of seven coexisting ions. Soil remediation tests and column leaching experiments further demonstrate that SAA-LDH could immobilize 98.32 % of Cd(Ⅱ) and 97.71 % of Cr(Ⅵ), preventing its migration. Density functional theory (DFT) manifests that SAA-LDH could remove Cd(Ⅱ) and Cr(Ⅵ) through isomorphic substitution and ion exchange respectively under single system. Under compound system, Cd(Ⅱ) fixed with isomorphic substitution could promote the immobilization of Cr(Ⅵ) onto SAA-LDH, constructing hyper-stable coordination structure. This study provides an effective approach to simultaneously recycle hazardous waste and remediate heavy metals contamination in soil.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Wei Liu,Zhaoliang Wu,Yanji Wang,Huijie Zheng,Hao Yin
At present, the large scale application of batch foam fractionation is still in confrontation with many problems and difficulties, especially for the enrichment of non-surface-active materials. It is difficult to select a suitable surfactant as the collector when a non-surface-active material can only form a stable association with the expensive surfactants or has not any interactions with the commercially available surfactants. The objective of this work was to investigate the feasibility of batch foam fractionation for recovering such a non-surface-active material, puerarin. Yam mucilage, an abundant byproduct from the manufacture of yam starch, was used to generate a stable foam phase based on its good foamability. According to the properties of puerarin and yam mucilage, β -cyclodextrin ( β -CD) was selected as a basic material to establish an association between them. The results of fluorescence sensitization experiments indicated that puerarin could form an equimolar inclusion complex with β -CD and the inclusion constant was 405.8. Subsequently, β -CD was modified by introducing carbon disulfide and copper (Cu) ion. Then, puerarin could be adsorbed on the gas-liquid interface in the form of ternary complex with modified β -CD-Cu ion complex and glycoprotein molecules (see Fig. 7). Batch foam fractionation was carried out by using the crude extracting solution as the initial feeding solution, in which the concentration of puerarin was as high as 4.6 g/L. Under the suitable conditions of temperature 50 °C, pH 6.0, loading volume of feed solution 400 mL, the pore diameter of gas distributor 0.450 mm, additive volume of yam mucilage 30 mL and volumetric air flow rate 100 mL/min, the enrichment ratio and the percent recovery of puerarin were 4.3 and 82.3%, respectively. This strategy could be generalized to the separation of various non-surface-active materials due to the low cost and the diversiform cavity dimension of cyclodextrins.
研究领域:
植物化学
·
分离工程
·
天然产物开发
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高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Longda Gong,Jingwen Wang,Touqeer Abbas,Qichun Zhang,Mei Cai,Muhammad Tahir,Dan Wu,Hongjie Di
Cadmium (Cd) pollution is a widespread environmental problem that decreases crop production, destroys the microbial ecology of soil, and poses a severe risk to human health. Organo-chemical amendment is a cost-effective, eco-friendly, and community-acceptable widely applied an in situ technique for metal-contaminated farmland. In this study, we mixed lime, zeolite, calcium magnesium phosphate fertilizer, and biochar in a mixture ratio of 71:23:5:1 to form a mixed amendment. Field and laboratory experiments were conducted to study the effects of the mixed amendment on soil exchangeable Cd content, plant Cd accumulation, and soil microbial community . It was found that the application of 0.5% mixed amendment decreased exchangeable soil Cd by more than 85% and 64% in wheat and rice season, respectively, compared with control (CK), without increasing pH. Moreover, the application of 0.5% mixed amendment decreased Cd accumulation in grains by 22.9% and 41.2% in wheat and rice season, respectively, compared to CK. The result of phospholipid fatty acids (PLFAs) shows that the level of soil microbial diversity and species richness under mixed amendment treatments were higher than in lime treatment, indicating more copiotrophic conditions and faster rate of nutrient turnover in mixed amendment than pure lime treatment. Hence, it concluded that the mixed amendment has a strong effect on fixing exchangeable soil Cd and reducing the accumulation of Cd in crops. Finally, it was observed that the mixed amendment improved the soil microbial community structure and accelerate the rate of nutrient turnover by microbes under this favorable condition comparative to individual treatments.
研究领域:
环境科学
·
土壤学
·
微生物学
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 13
·H967
·
IF 3.259
Sanshuang Gao,Chuyang Xu,Nuerbiya Yalikun,Xamxikamar Mamat,Yongtao Li,Thomas Wågberg,Xun Hu,Jing Liu,Jun Luo,Guangzhi Hu
Carbon matrix materials are regarded as one of the most important electrode materials for heavy metal detection. But even so, optimization procedures of carbon nanofibers (CNFs) for tracing Cd(II) and Pb(II) remains challenging. Here, zeolitic imidazolate framework (ZIF-8)/polyacrylonitrile (PAN)-derived nitrogen-doped porous carbon nanofibers (N-PCNFs) were investigated as a new electrode material for determining the concentration of Cd(II) and Pb(II). By optimizing electrochemical conditions such as deposition potential, deposition time, pH of buffer solution, and quantity of N-PCNFs loaded on a glassy carbon electrode (GCE), the linear response curves of Cd(II) and Pb(II) could be obtained. Due to the unique structural feature and N content, the N-PCNFs possess excellent detection limits of 0.8 μg L−1 for Cd(II) and 0.3 μg L−1 for Pb(II) (S/N = 3). To manifest the practical use of the sensor platform the concentration of Cd(II) and Pb(II) in normal tap and waste water were monitored. According to the ICP-MS results, the calculated recovery (97.0–107%) indicates that N-PCNFs have potential as a candidate material to monitor the concentration of Cd(II) and Pb(II) in practical samples.
研究领域:
环境科学
·
材料科学
·
分析化学
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Rongguo Chen,Chenchen Lin,Haixia Lyu,Xucong Lin,Zenghong Xie
A facile strategy for highly efficient fabrication of chiral monolithic column was carried out by the simple “one-pot” hydroxymethyl polycondensation of native β-cyclodextrin (β-CD) and urea-formaldehyde (UF). In-situ rapid substitution of native β-CD and efficient polycondensation of β-CD products and UF oligomers was proposed and fulfilled in one pot. The feasibility, mechanism and key parameters of polycondensation reaction were discussed. The data on crosslinking polycondensation and reaction kinetics were further evaluated. Characteristics including the morphologies, permeability and structure stability of the resultant monolithic columns were also studied. Under the optimal conditions, the “one-pot” hydroxymethyl polycondensation was accomplished in an aqueous solution within only 10 mins. Satisfactory stability and repeatability were gained, and good enantioseparation of eight model enantiomers was successfully achieved with the resultant β-CD-based monolith. It was simple and highly efficient, and the organic solvents, special CD derivatives and tediously long-time polymerization reaction were successfully avoided, which might light a new access to rapid preparation of CD-chiral monolith for high-performance enantioseparation.
研究领域:
分析化学
·
色谱技术
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Zhou Liuzhu,Sankar Sekar,Jin Chen,Sejoon Lee,Deuk Young Kim,Ramalingam Manikandan
Here, we report a simple one-step preparation of polyrutin/silver nanoparticles (AgNPs) on the glassy carbon electrode (GCE) surface using an electrochemical deposition/polymerization technique. As prepared polyrutin/AgNPs/GCE has been characterized by different techniques such as SEM with elemental morphing, TEM with EDAX , XRD , ATR-IR to confirm the materials formation. Further, electrochemical behavior of the polyrutin/AgNPs/GCE was tested by cyclic voltammetry , EIS and differential pulse voltammetric techniques. As fabricated polyrutin/AgNPs/GCE was used for simultaneous detection of Pb(II) and Cd(II)ions using anodic stripping voltammetric techniques and stripping analysis of Pb(II) and Cd(II)ions analytical parameters like pH, preconcentration time were studied. The polyrutin/AgNPs/GCE has showed a linear concentration range from 29 nM to 140 nM and 57–203 nM with detection limit of 3 nM and 10 nM for Pb(II) Cd(II)ions respectively. Further, the modified electrode was tested towards detection of these heavy metal ions in different environmental samples and the found excellent recovery results were further correlated with ICP-MS results.
研究领域:
环境科学
·
分析化学
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Junjie Wang,Hui Zhou,Yang Li,Yeshu Mu,Jinghua Li,Chen Hong,Wen Luo
A novel series of benzo[ cd ]indol-2(1 H )-one-donepezil (BIO-DPZ) hybrids (5a-m, 6a-k) was designed, synthesized and evaluated as cholinesterase inhibitors and living cell imaging agents. These compounds were potent inhibitors of both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). Compound 6a exhibited the strongest inhibitory activity against AChE with an IC 50 value of 0.16 μM. Compound 6i had the strongest inhibition of BuChE with an IC 50 value of 5.37 μM. Kinetic and molecular modeling studies showed that 6a bound both catalytic active site and peripheral anionic site of AChE. Compounds 6a and 6i both showed lower SH-SY5Y, HepG2 and HL-7702 cytotoxicity than the mitoxantrone. Promisingly, the most active compound, 6a, was successfully used in living SH-SY5Y cell imaging and had predictable lipophilicity and blood-brain-barrier permeation properties. These hybrids should undergo further systematic study in the treatment of Alzheimer's disease.
研究领域:
药理学
·
神经科学
·
药物化学
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高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 41
·20110-20120
·
IF 9.931
Jianhong Ma,Jinming Luo,Yutang Liu,Yuanfeng Wei,Tao Cai,Xingwen Yu,Hui Liu,Chengbin Liu,John C. Crittenden
A systematic study of the interaction between adsorbents and potentially toxic metal ions in multicomponent systems is of great significance due to the coexistence of multiple potentially toxic metal ions in the real water environment. In this study, a new humic substance-based double network hydrogel (PAA/HS gel) was produced by a radical polymerization method and applied to Pb(II), Cu(II) and Cd(II) removal in both individual and multicomponent systems under various conditions. The macroporous network structure (aperture ≈ 10 μm) and high water permeability of the PAA/HS gel could fully facilitate the active site exposure and increase the potentially toxic metal ion diffusion rate. The PAA/HS gel exhibited high theoretical adsorption capacities of 360.50, 151.00 and 412.76 mg g−1 for Pb(II), Cu(II) and Cd(II) in individual systems. Noticeably, both interference and promotion of adsorption behaviors were identified in multicomponent systems. In binary systems, the adsorption capacity and rate were decreased for Pb(II) and Cu(II), while increased for Cd(II). In ternary systems, the adsorption capacity and rate for Pb(II), Cu(II) and Cd(II) were decreased. The adsorption isotherms and kinetics were well fitted by Langmuir–Freundlich and Elovich models, respectively, indicating that the PAA/HS gel possessed a heterogeneous surface and various types of binding sites. The FTIR and XPS studies confirmed that both nitrogen- and oxygen-containing functional groups (i.e., amino, phenolic hydroxyl and carboxyl groups) were involved in the adsorption process, while the interactions between functional groups and Pb(II), Cu(II) and Cd(II) were different.
研究领域:
环境科学
·
材料科学
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高影响因子
危险品化学品经营许可证（带存储）